The Experts below are selected from a list of 609 Experts worldwide ranked by ideXlab platform
Mark C. Pirlo - One of the best experts on this subject based on the ideXlab platform.
-
Hydrogeochemistry and geothermometry of thermal groundwaters from the Birdsville Track Ridge, Great Artesian Basin, South Australia
Geothermics, 2004Co-Authors: Mark C. PirloAbstract:Abstract The hydrogeochemistry of thermal artesian groundwaters flowing from 12 stock bores along the Birdsville Track Ridge in northeast South Australia has been examined. The Na-HCO3-Cl type groundwater composition has provided a basis for the application of chemical geothermometers to estimating aquifer temperatures and has allowed comparisons of various silica and cation geothermometers. Aquifer and bore penetration depth decrease between Birdsville and Marree from 1220 m to 170 m. A corresponding decrease in measured emergence temperature is also observed (94–31 °C). Chalcedony Geotemperature estimates ranging from 110 °C to 41 °C between Birdsville and Marree are considered the most accurate of the various geothermometers tested. Log(Q/K) versus T diagrams have also been evaluated to determine likely aquifer mineral assemblages and reservoir temperatures (111–39 °C). The Birdsville Track Ridge acts as a conduit for low salinity groundwater (total dissolved solids range from 640 mg/l at Birdsville to 1900 mg/l at Marree) in the Great Artesian Basin. Old, slowly migrating groundwater from the deeper basins on either side of the ridge is characterised by higher emergence temperature and higher total dissolved solids. This old groundwater is inferred to have mixed with the younger, lower temperature, lower salinity groundwater that is migrating relatively rapidly along the Birdsville Track Ridge axis. Since the various geothermometers provide distinct types of information, evidence for the mixing is provided by the interpretation of the different temperature estimates. Silica equilibration temperatures reflect aquifer temperatures along the ridge axis, whereas cation Geotemperatures partly preserve higher temperatures from the deeper, flanking basins. This study demonstrates how the thermal regime and hydrodynamics of an area can be characterised using a sparse dataset, thus representing a novel and effective methodology for regions anomalous to this central Australian example.
-
The silica heat flow interpretation technique: application to continental Australia
Journal of Volcanology and Geothermal Research, 2002Co-Authors: Mark C. PirloAbstract:Abstract The silica heat flow interpretation technique [Swanberg, C.A. and Morgan, P., J. Geophys. Res. 117 (1979) 227–241; J. Geophys. Res. 85 (1980) 7206–7214] has been applied and tested in mainland Australia, using a database of approximately 41 000 Australian groundwater analyses. The silica Geotemperature of the groundwaters was obtained by substituting the dissolved silica content of a groundwater into the quartz geothermometer equation of Truesdell [(1976) Proceedings of the Second United Nations Symposium on the Development and Use of Geothermal Resources. San Francisco, CA, USA, 20–29 May, 1975, Vol. 1]. The average silica Geotemperature value for 1×1° (latitude×longitude) grid cells has been calculated and the results plotted against published traditional heat flow values for those grid cells [Cull, J.P. (1982) BMR J. Aust. Geol. Geophys. 7, 11–21], to form silica heat flow estimation models. Data exclusion criteria, based upon data quantity and statistical spread have been applied to both the groundwater data and the traditional heat flow data. This was done in order to exclude areas that were poorly categorized in terms of data quality and quantity. For the remaining data, a significant linear relationship between the groundwater Geotemperature estimates and traditional heat flow measurements has been identified for four of the models with a t-test on the correlation coefficient. Estimates of regional heat flow were then made by applying the calibration models in areas with no traditional heat flow measurements but adequate groundwater data. A silica heat flow map has been constructed using one of the models and the differences between it and the traditional heat flow map evaluated. Good correlations exist between the silica heat flow map and the traditional heat flow map, except for the northwest Yilgarn, of WA, Australia, where silica heat flow data give significantly higher values than traditional data. The silica heat flow map identifies areas of high heat flow associated with some large-scale geological features such as the granite belt in southeastern Australia. The calibration models result in some silica heat flow estimates exceeding natural likely values. This suggests that the calibrations need further refining for Australian conditions.
Wu Chuan - One of the best experts on this subject based on the ideXlab platform.
-
Relationship between Accumulation of Natural Gas and Geotemperature-Geopressure System in Yinggehai Basin
Natural Gas Geoscience, 2008Co-Authors: Wu ChuanAbstract:Yinggehai Basin is a youthful Cenozoic sedimentary basin with extension and transform.There are relationships between Geotemperature-geopressure system,source rock thermal evolution and migration accumulation of natural gas.Based on the analysis of the distribution of the geopressure field and the Geotemperature field,there are two types of Geotemperature-geopressure systems in the basin:composite geoperature-geossure system of high pressure in the central sag and singleness of temperature-geopressure system in the Yingdong slope.The controlling function of different Geotemperature-geopressure systems on migration and accumulation of natural gas were analyzed.The vertical migration and accumulation of natural gas are under the control of conducting system and composite temperature-pressure system of high pressure,and the singleness of Geotemperature-geopressure system and feebleness of vertical hydrodynamic force are the main reasons for lateral migration of the gas.There are important relationships between the migration of natural gas and the Geotemperature-geopressure systems in the Yinggehai basin.
Chen Weihuang - One of the best experts on this subject based on the ideXlab platform.
-
Geotemperature field and up welling action of hot flow body and its relationship with natural gas migration and accumulation in yinggehai basin
Natural Gas Geoscience, 2000Co-Authors: Chen WeihuangAbstract:Yinggehai basin is a high Geotemperature basin that developed at Eogene, and its high Geotemperature field and high value of terrestrial heat flow mainly concentrate in the shale piercement belt of central downwarp area in basin. Development and evolution of shale piercement bell and especially upwelling action of hot flow body in late Pliocene epoch are close related with the migration and accumulation of natural gas and especially non-hydrocarbon (CO2). The local invasion of hot flow body, which is characterized by different layer, block and district, leads the migration and accumulation of hydrocarbon and non-hydrocarbon (CO2) to possess the same characteristics. And the development and evolution of shale pierce merit and upwelling action of hot flow body is the dominant factor which influence the migration, accumulation and reservoir forming of hydrocarbon and especially non hydrocarbon (CO2). The difference between hydrocarbon and non-hydrocarbon (CO_2)on time and channel of migration and accumulation is the main factor which control and constraint the different migration, accumulation and reservoir forming of hydrocarbon and non-hydrocarbon.
Liangshu Wang - One of the best experts on this subject based on the ideXlab platform.
-
Distribution Characteristics of the Geotemperature Field in the Jiyan Gdepression, Shandong Province, North China
Chinese Journal of Geophysics, 2003Co-Authors: Yuling Gong, Liangshu Wang, Shaowen Liu, Lingzhi Guo, Jingong CaiAbstract:Based on the analysis of Geotemperature data derived from 703 exploration wells in the Jiyang depression of the Shengli oilfield, Shandong, North China, in conjunction with corresponding geothermal calculation results, we present the geothermal field distribution characteristics of this region, which include the plane contour plots of geothermal gradient present day, Geotemperature at 3km, 4km and 5km depth, respectively, as well as the one at the top surface of lower Tertiary Es4 formation of the Jiyang depression. The average geothermal present day gradient of the whole Jiyang depression is about 35.5°C/km, the corresponding gradients of its four main sags, i.e. Zhanhua, Dongying, Chezhen and Huimin are 36.1°C/km, 35.5°C/km, 35.4°C/km, and 34.6°C/km, respectively. While for the Weibei sag, on the outer flank of the Jiyang depression, it is 35.5°C/km. The distribution of geothermal gradient and Geotemperature in the Jiyang depression is mainly governed by its tectonic framework of alternating uplifts and depressions areas. This distribution is also related with the basement depth, characterizing by higher temperature in uplifts and lower one in depressions. In addition, those regions of relatively high geothermal gradient are consistent with areas of Cenozoic volcanic rock distribution. The pattern of basement depth of the Jiyang depression, which also represents the distribution of uplifts and depressions, is controlled by the lithospheric stretching during basin formation. This geodynamic process also accounts for the distribution of volcanic rocks in this region. Consequently, the geothermal field characteristics of the Jiyang depression arc resulted from its tectonic evolution process. In addition, our results also indicate that most of the Es4 formation in the Jiyang depression is still within liquid window of oil and gas.
-
Geotemperature gradient distribution of kuqa foreland basin north of tarim china
Chinese Journal of Geophysics, 2003Co-Authors: Liangshu WangAbstract:Based on the geo-temperature data of 109 wells of Kuqa foreland basin in the north flank of Tarim basin, the characteristics of the temperature field are studied. The average geo-temperature gradients in different regions of Kuqa basin are between 18℃/km and 28℃/km, which is lower than those in other middle and large scale basins in China, implying the cold Kuqa foreland basin. The distribution of geo-temperature gradient of Kuqa foreland basin can be described in detail as following: The mountain frontier belt, including Yiqikelike, Kelasu and Dawanqi areas, has relatively high geo-temperature gradient compared with other structural units of Kuqa. From the North to South of Kuqa, the geo-temperature gradient decreases gradually. At the South of Kuqa, the geo-temperature gradient is clearly different. In general, the geo-temperature gradient decreases with increasing depth, tending to be identical in deep. The decrease rate of the geo-temperature gradient is different in different tectonic settings. The relationship between geo-temperature gradient and formation and tectonic evolution of basin with hydrocarbon exploration are discussed further here.
-
Distribution feature of terrestrial heat flow densities in the Bohai Basin, East China
Chinese Science Bulletin, 2002Co-Authors: Liangshu Wang, Shaowen Liu, Weiyong Xiao, Suiping Guo, Bo Liu, Yuhui Luo, Dongsheng CaiAbstract:Temperature logging curves at 8 boreholes and well-testing temperature data at 142 boreholes are used to determine Geotemperature gradients in the Bohai Basin. The thermal conductivities of 86 rock samples are measured at laboratory and the effects of porosity and temperature are corrected to obtain conductivities in situ. Terrestrial heat flow densities at 76 wells are determined based on these data. The distribution of the heat flow indicates that the terrestrial heat flow in the Bohai Basin is relatively high with an average value of 65.8 mW/m2. This characteristic is caused by the tectonic evolution of the basin. During Cenozoic, the litho-sphere stretched intermittently and the crust thinned so that heat conducted from the mantle increased and formed thermal abnormity at depth beneath the basin.
Mingyi Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Laboratory investigation of the efficiency optimization of an inclined two-phase closed thermosyphon in ambient cool energy utilization
Renewable Energy, 2019Co-Authors: Wansheng Pei, Mingyi Zhang, Yuanming Lai, Yuanhong Dong, Long JinAbstract:Abstract Some environmental and engineering problems are associated with permafrost thaw or degradation due to the releasing of CO2, the reducing of soil strength and the change of hydrologic processes. How to control the geothermal to approach these problems in cold regions is an important issue. Two-phase closed thermosyphons (TPCTs) are simple and efficient energy exchangers that are used in low-temperature refrigeration systems. In this study, a series of experiments were carried out to explore the Geotemperature control process of a TPCT in an air-TPCT-soil system by storing renewable ambient cool energy. To enhance the control efficiency of the TPCT, we considered different operating conditions, with inclination angles of 90°, 70°, and 50°. The results indicate that the TPCT can cool the surrounding soil by selectively capturing the ambient energy due to its thermal semi-conductor effect. The inclination angle can change the efficiency of the TPCT, which should be accounted in engineering design. Under the experimental conditions, the Geotemperature control efficiency of the TPCT with an inclination angle of approximately 70° was the optimal. The results of this study could provide a basis for the design of TPCTs used in cool energy utilization and other energy storage applications.
-
Geotemperature control performance of two phase closed thermosyphons in the shady and sunny slopes of an embankment in a permafrost region
Applied Thermal Engineering, 2017Co-Authors: Mingyi Zhang, Shuangyang Li, Wei Zhai, Fan Yu, Jianguo LuAbstract:Abstract Heat pipes are a widely-used technology for energy exchange in the world. One of the important issues in the future is how ground heat control can meet the demands of the environmental and engineering stabilities in cold regions. In this paper, a low-temperature gravity assisted heat pipe (two-phase closed thermosyphon, TPCT) is innovatively installed in an embankment with shady and sunny slopes to adjust the Geotemperature of the underlying permafrost stratum. The geothermal conditions for three cases—an embankment without TPCTs, an embankment with unilateral TPCTs (UTPCTs), and an embankment with bilateral TPCTs (BTPCTs)—are assessed based on a three-dimensional heat transfer model considering the global warming. The model includes coupled air-TPCT-soil heat transfer and conductive heat transfer with phase change. The numerical results show that: (1) both the UTPCTs and BTPCTs can cool the permafrost stratum, but the UTPCTs aggravate the asymmetric Geotemperature caused by the shady-sunny slope effect; and (2) the BTPCTs are better to alleviate the asymmetric Geotemperature by controlling the working time and efficiency of the TPCTs under the two slopes. Consequently, the BTPCTs are a more effective engineering measure for embankments affected by the shady-sunny slope effect.
-
Thermo-mechanical stability analysis of cooling embankment with crushed-rock interlayer on a sloping ground in permafrost regions
Applied Thermal Engineering, 2017Co-Authors: Wansheng Pei, Mingyi Zhang, Yuanming Lai, Long JinAbstract:Abstract Some embankments of highways are inevitably built on slopes in permafrost regions. It is usually difficult to ensure the stability of the embankments on sloping ground because of the asymmetric Geotemperature and stress distribution. The crushed-rock layer is often layed in the slope areas to control the Geotemperature. Cooling performance is focused to evaluate the thermal stability of crushed-rock embankment, but the mechanics are poorly concerned. This study developed a thermo-mechanical model to evaluate the influence of the cooling effect of crushed-rock layer on the mechanical state of embankment on sloping ground. Two embankments are taken as examples according to the engineering practice in permafrost regions on the Qinghai-Tibet Plateau, i.e., the unprotected embankment and the crushed-rock interlayer embankment. To analyze the stability of sloping embankments, the Geotemperature, principal strain, deformation and safety factor in four typical seasons are simulated during operations. Numerical results indicate that the crushed-rock interlayer can effectively cool the sloping embankment and its foundation. Meanwhile, the cooling effect of the porous layer can reduce the uneven settlements to improve the safety reverse of the embankment. This study can also provide scientific basis and reference for the design of similar engineering structures in permafrost regions.